Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a5453d0604b935…

MALICIOUS

PDF

87.8 KB Created: 2021-07-14 10:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d28f0c1c0bc8ce3f44750f720b79b2c9 SHA-1: 7c1a5f34e3a50591a5706a3082b5ce468e2123bd SHA-256: 66a5453d0604b9358f7df093cb2bd4b8da3e02180989bddfd85b517063e9d046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised websites, including those hosted on WordPress upload storage. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/vanes.pdf In PDF document text
    • http://krakow4you.pl/krakow/files/wofefelaz.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bbc3cf07---56246855809.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2344187629---fivobuvoxofirexirejawito.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/86919132548.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/140344139022.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078835041c58---44734801086.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b087622c6d4---telorana.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fed6b44a2---68264412699.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bobukawuxijewupofuririj.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/tulelela.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lusagokoxukunezinagupu.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/1aff678ea1f6006ddf1886ed22b161f4/dewerudotap.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c2299508e---61046638110.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de70857f6a---2406762413.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/48026523723.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/64841962170.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bisemuzevepijijogi.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210708060530_1785245155.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb61407c30---pekurugugon.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bc0793ad---renegekefor.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/20754d52575ddb40a2c9b94ba981c75e/87148283768.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/5370805607.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/wiraxowazobirenujutego.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607593c81cb19---87970759725.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021071304515918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=encouraging+words+that+start+with+bPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 16084 bytes
SHA-256: 7880ccf76095395961573c6333c574a311b7908ece6311718cb0c1c4a317ecae
font_01_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13762 10780 bytes
SHA-256: 6d39c187fb0aa11c21827fa5acac20e77d04542851b65f0eb298db01f787e9e0

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